Rotary pump.



No 735,339. PATENTED AUG. 4, 1 903 s E. w. BROOKS.

ROTARY PUMP. Y WA APPLICATION FILED SEPT. 25, 1901. 1 m 10mm.

PATENT UNITED I STATES Patented August 4, 190d.

OFFIGE;

EVERETT w. BROOKS; OF oHIoAeo, ILLINoIs.

ROTARY WM SPECIFICATION forming part of Letters Patent No. 735,339, dated August 1905? Application filed September 25 Serial No. 76,517. (No model.)

To all whom) it may concern.-

Beit known thatl, EvE ETr W. BRooKs, of the city of Chicago, county of Cook, andlSt-ate of Illinois, have invented certain new and use{ ful Improvementsin Centrifugal Pumps, of Which the following is a specification.

This invention relates to improvements in a centrifugal pumps, and refers more specifically to an improved type of centrifugal pumps in which a hollow cylindric member provided with a diaphragm or plurality of vane-like plates is rotated within a correspondingly shaped chamber and operates by centrifugal force to pump liquid therethrough.

Among the salient objects of the present invention are to provide a construction of the utmost simplicity and relatively high efficienoy, to provide an improved construction and arrangement of the diaphragm or pallet member which actsfuponf the fluid, to provide an improved construction andarrange merit of the discharge-ports' through which the liquid is delivered, and in general tosimplify and improve the details of construction of the device as awhole. 1 The invention consists in the matters hereinafter described, and more particularly pointed out in the appended claims, and the same will be readily understood from the following description, reference being had to the accompanying drawings, inwhichf; j a

Figure 1 is an axial vertical sectional view of a pump embodying my invention. a Fig. 2

is a transverse vertical sectional yiew taken on line 2 2 of Fig. 1 and lookin'gin the direction of the arrows. Fig. 3 is all transverse sectionalview of the liollowpistonmember removed'frorn the casing; and Fig. 4: is a view similar to Fig. struction. v

Pumps of this general character are known in the-priorart, one goodexample of such a prior construction being shown and described 3,. showing a modified conin Reissued Patent No. 12,001, issued June 17, 1902, to William S. Sharpn eck. The present invention has to do with improvements upon the type of pumps shown in said patent.

It would seem from the constructions which have heretofore been devised and with which I am familiar that the theory upon which such prior pumps have been constructed has been to provide for the passage of the liquid from the hollow piston as soon as possible or as soon as sufficient motion has: been imparted to the liquid tocause it to flow radially outward, all the prior constructions of this general type with which I am familiar being provided with radial ports or passages'ortheir equivalents dispersed around the entire circumference of-the piston. I have discovered,

however, thatcontrary to this theory a more effective action and higher efficiency may be obtained by providing a hollow piston which is circumferentially closed except at points substantially coincident with the intersection of the outer ends of the vanes or pallet mem= bers with the cylinder-walls of the piston. I

have further discovered that with the discharge-ports from the piston thus arranged the eificiency of thepump may be still further augmented by embodying the vane members in the form of a diaphragm completely partitioning the interior of the'piston and having the form in cross-section of a reverse curve, so that a convexlycurved and spirally-disposed surface is constantly presented to the body of water being acted upon, which tends to deflect the water radially outward or in the same direction as the centrifugal action tends to move itthat is, by forming the vanes or 1 pallet members in the manner described I combine with the centrifugal action imparted to the liquid by whirling it a propelling action,

due to the blade or vane being forced through the liquid while held in a position oblique relatively to its path of movement.

1 Referring more specifi oally to the specific embodiment shown herein, ldesignates as awhole a cylindric casing which may be formed in any desired or suitable manner and is provided at one end with an axially-disposed inlet-passage 2 and atone of its cylindric sides with a radially-disposed outlet-passage 3. In the particular instance shown said casing is formed of two end members or castings, (designated a and 5,respectively,) between the facing sides of which is bolted a cylindric member 6, provided at one side with an integral nipple-like extension 7, forming the outlet 3 hereinbefore referred to. The end casting 4: is provided with an integral axially-disposed tubular extension 8, which forms the inlet to the pumpchamber, the outer end of said extension be "ing desirably internally threaded to receive the end of the aspiration-pipe 9. The opposite end member is provided with an integral journal extension axially bolted to receive a shaft 11, which actuates the piston, hereinafter to be described, the outer end of the shaft 11 being provided with a belt-pulley 12, whereby the shaft and piston are mounted thereon.

Describing now more particulary the construction of the piston, which is designated as a Whole 13, the latter comprises a cylindric shell closed at one end, as indicated at 14, and mounted rigidly upon the inner end of the actuating-shaft 11, being to this end provided with an inwardlyextending hollow lug or socket 15, into which the end of the shaft 11 extends. The opposite end of the shell or that which communicates with the inlet-passage 2 is desirably left open.

16 designates a diaphragm arranged to extend diametrically across the interior of the cylinder, so as to completely partition the latter, said diaphragm being arranged to extend in a plane coincident with the longitudinal axis of the shell. It will beunderstood that the diaphragm thus constructed and arranged constitutes in substance a pair of radially disposed vanes or pallets, which act to impart to the water flowing into the shell a rotary movement as the piston is rotated.

17 and 18 respectively designate outletports formed throughthe cylindric side walls of the shell, these ports being located at points coincident with the advance sides of the two vanes which form the diaphragm considered with reference to the direction of movement of the piston when in operation. Desirably and as shown herein these ports are formed through the shell of the piston in a direction somewhat oblique to a radius and inclined rearwardly and outwardly relatively to the direction of movement of the pistons, this direction being approximately the direction in which the stream of liquid flowing through the port will be discharged.

The ports 17 and 18 preferably and as shown herein extend the full axial length of the interior of the piston, and the cylindric wall 6 of the casing which incloses the piston is of somewhat greater internal diameter than the exterior of the piston, so as to afford an annular space 19 surrounding the piston. The end walls of the casing are, however, constructed to fit as closely to the ends of the piston as is consistent with freedom of movement of the latter.

The operation of the device constructed as ,9 to the axis of the piston and is there given a rapid rotary motion, which induces the liq- .uid to flow out radially through the dischargeports 17 and 18 in the space 19 and through the discharge-passage 3. It will be understood that the discharge-passage may be arranged to extend in any desired direction, either up, down or to either side, it being practically immaterial from what point in the circumference of the piston-casing the discharge-passage opens. The fact that the piston-shell is closed at its sides except as to the discharge-ports 17 and 18 induces a very effective exhausting action and contributes greatly to the suction power of the pump, it being obvious that with this construction the backfiow of air through the outlet, and'thus into the interior of the piston, is much more efiectually prevented than in the case of pistons of this general character provided with ports disposed at frequent intervals around their circumference. Furthermore, the cylindric side walls of the shell serve to confine the liquid and force the latter out through the slot-like ports in a practically solid stream, which in itself prevents the backflow of air or ventage, thereby inducing a very perfect action, which correspondingly increasesthe effectiveness and capacity .of the pump.

While the construction shown in Figs. 1, 2, and 3 is therefore highly efficient, I have found that the efficiencyof a pump of this character may be still further augmented by imparting a convex and spirally-disposed shape to the two vanes which together form the diaphragm, such a construction being shown at 16 in Fig. 4. In this instance the discharge-ports 17 and 18 bear the same relation to the advance or convex sides of the vanes as in the former construction, the direction of rotation being indicated by the arrow in said Fig. 4:. This form of piston may obviously be used in a pump-casing and in conjunction with other parts constructed precisely like that shown in Fig, 1.

In the operation of a pump having a piston like that shown in Fig. 4 the convexly-curved and spirally-disposed vanes act to force the liquid radially outward by their impact there with, since these vanes are moved through the body of liquid While held in a position oblique relatively to their path of movement. The effect is therefore to add to the centrifugal action of the device the impelling action of the vanes, thus increasing the efficiency of the pump as compared with a pump having a straight diaphragm working under similar conditions.

While I have herein shown and described what I deem to be a preferred embodiment of the invention, yet the details thereof may be modified without departing from the invention, and I do not, therefore, wish to be limited to these details except to the extent that they are made the subject of specific claims.

I claim as my invention 1. In a centrifugal pump, the combination of a suitable casing, a hollow rotary piston arranged therein, having peripheral walls internally and externally substantially circular and concentric with the axis of rotation of the a length to extend over a zone of greater width than one-half the diameter of the inlet.

2. In a centrifugal pump, the combination of a suitable casing, a hollow rotary piston arranged therein, having peripheral walls internally and externally substantially circular and concentric with the axis of rotation of the piston, one or more internal pallet-blades extending radially, an axial inlet and a periph eral discharge-outlet in the form of a 0011- tinuous slot extending longitudinally of the piston and coincident with the advance surface of each pallet-blade; said discharge slot or slots being of a length and arranged to extend over a zone of greater width than onehalf the diameter of the inlet.

3. In a centrifugal pump, the combination of a suitable casing, a hollow rotary piston arranged therein having peripheral walls internally and externally circular and concentric with the axis of rotation of the piston, a diaphragm dividing the interior of said piston longitudinally and forming in effect a pair of pallet-blades, said diaphragm being of reversed curve form in cross-section, an axial inlet, and discharge-ports having the form of continuous slots arranged to extend longitudinally of the piston and coincident with the advance surface of said pallet-blades considered with reference to the direction of rotation of the piston, said discharge-slots being of a length and arranged to extend over a zone of greater width than one-half the diameter of the inlet.

4:. In a centrifugal pump, a piston provided with an axial end inlet, one or more internalpalleLt members and peripheral outlets in the form of longitudinally-disposed slots extending over a delivery zone wider, measured longitudinally of the piston, than one-half the mean diameter of the inlet thereof.

EVERETT W. BROOKS.

Witnesses:

ALBERT I-I. GRAVES, FREDERICK C. Goonwm. 

